Though Imouto made a pretty strong push later on. School Rumble was weird for me. I almost always pick a favorite girl from the start and never change my mind. I almost switched to Yakumo around the time she became Harima's assistant

Then I realized the only end that would make everyone happy would be a threesomeYakumo would go along with it without complaint and Eri would be OK after the first night they all spend together